TAILIEUCHUNG - Inspection Evaluation And Repair Of Steel structures Part 9

Tham khảo tài liệu 'inspection evaluation and repair of steel structures part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | EM 1110-2-6054 1 Dec 01 Figure 7-3. Two-stage CVN-Kid-Kic correlation C 5 9 F - 32 1 psi-Vin. kPa-Vm 1 ft-lb J 3 A CVN-KIc correlation that is valid at higher temperatures in the upper shelf region is given by 2 s . I í CVN I I C - Gy Gy 7-3 where KIc MPa - vm oy static yield stress in MPa CVN joules For non-SI units CVN - 0 05 Gy 7-3 EM 1110-2-6054 1 Dec 01 structure is framed similar to the standard tainter gate geometry as described by EM 1110-2-2702 with a 3 8-in. skin plate C12 X 25 vertical ribs two W30 X 118 horizontal girders and W18 X 80 strut arm frames. All connections are riveted except for the use of bolts at the strut arm-trunnion block detail. The gates have Type J side seals and steel bottom seal details. The gates have a history of structural problems including significant gate vibrations and buckled web and flange plates on the strut arm. No extreme loads or unusual events had been reported since the last inspection. A change in operational practice was instituted to avoid gate opening settings that cause structural vibration. Because of the history of problems at this site a thorough visual inspection was made previously on several gates. 2 Inspection. An in-depth inspection was made of the gate with particular attention to the critical areas. Weather conditions at the dam site during the inspection were sunny and warm. The examination was conducted while water was being released from the gates. The following conditions were noted a Member or component deformation. Local web and flange plate buckling on the strut arms adj acent to the knee brace intersection from the upper horizontal girder was visible on several gates and is most severe on Gate 24. The condition has not deteriorated since the last inspection and was most likely caused by excessive ice loads on the structure. b Seal problems. Water was observed flowing through the side seals. c Rivet deterioration. Corrosion and a small amount of section loss were

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